Line Capture Modes

LineCaptureMode	Description
ALL	"Take-All-Line" line capture mode The board acquires all the lines delivered by the camera providing that the acquisition channel is active and the trigger conditions are satisfied. If the downweb motion speed is varying, the line-scanning process of the camera would be rate-controlled accordingly. This is the default line capture mode.
PICK	"Pick-A-Line" line capture mode Each pulse occurring at the downweb line rate determines the acquisition of the next line delivered by the camera providing that the acquisition channel is active and the trigger conditions are satisfied. This downweb resampling method allows the camera to be operated at a constant line rate while acquiring lines at a variable downweb line rate.
TAG	Tag-A-Line line capture mode The line-scanning process of the camera is running at a constant rate determined by Period_us. The down-web line rate is determined by the pulse rate of A/B signals delivered by an external encoder and processed by the quadrature decoder and the rate divider. The frame grabber captures all lines delivered by the camera after having replaced the first pixel data by a tag indicating that the line was preceded or not by an hardware event on the divider output.

LineCaptureMode

Description

ALL

"Take-All-Line" line capture mode

The board acquires all the lines delivered by the camera providing that the acquisition channel is active and the trigger conditions are satisfied.

If the downweb motion speed is varying, the line-scanning process of the camera would be rate-controlled accordingly.

This is the default line capture mode.

PICK

"Pick-A-Line" line capture mode

Each pulse occurring at the downweb line rate determines the acquisition of the next line delivered by the camera providing that the acquisition channel is active and the trigger conditions are satisfied.

This downweb resampling method allows the camera to be operated at a constant line rate while acquiring lines at a variable downweb line rate.

TAG

Tag-A-Line line capture mode

The line-scanning process of the camera is running at a constant rate determined by Period_us. The down-web line rate is determined by the pulse rate of A/B signals delivered by an external encoder and processed by the quadrature decoder and the rate divider. The frame grabber captures all lines delivered by the camera after having replaced the first pixel data by a tag indicating that the line was preceded or not by an hardware event on the divider output.

When LineCaptureMode = ALL, the Downweb Line Rate and the Camera Line Rate are the same. The requested resolution and the effective motion speed uni-vocally dictate the Downweb Line Rate. Then the camera has to be chosen to operate at an exactly matching Camera Line Rate, even if the speed of motion is varying. This imposes a requirement for a rate-controllable camera.

Using Downweb Resampling offers a way to eliminate the requirement for this exact match. The Camera Line Rate may be chosen at a fixed value, and the acquisition will still acquire lines at the expected downweb resolution, even when the speed of motion is varying.

The Tag-A-Line line capture mode is used together with the two-line synchronized line-scan acquisition advanced feature. This feature enables a line-scan imaging application to acquire, in a single scanning operation, images from 2 (or more) Basler Sprint bi-linear Bayer CFA color line-scan cameras with 2 illumination devices turned on alternatively. The Tag-A-Line line capture mode eliminates the spatial aliasing artifacts in the downweb direction that occurs when using the Take-All-Lines method.

The relevant and the applicable values of LineCaptureMode depend on two prerequisites settings: Imaging, CamConfig.

See also: Refer to Valid Line-Scan Synchronization Settings for a global view